Concealed hinge



(No Model.)

A. A. 'OAT, Sr. GONGEALED HINGE.

Padaen ted June '19, 189.4,

- HIE UNITED STATES PATENT FFICEG ALFRED A. OAT, 8B,, OF PHILADELPHIA, PENNSYLVANIA.

CONCEALED HINGE.

SPECIFICATION forming part of Letters Patent No. 521,528, dated June 19, 1894.

Application filed February 24, 1892. Serial No. 422,648. (No model.)

To all whom it may concern.-

Be it known that I, ALFRED A. OAT, S12, a citizen of the United States of America, and a resident of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Concealed Hinges, of which the following i is a specification.

My invention relates to a novel form of hinge for hanging doors, shutters, lids or other similar articles, which improved hinges will be concealed or invisible when the door or lid is closed, and will not project beyond the surface of the article so hung or swung. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a longitudinal elevation E F, G H, of one of my improved hinges, having flat or straight leaves Z Z opened and as it will appear when in use with the door or lid to which it may be attached swung open, and the two leaves connected by the double segmental curved link 6, the dotted lines showing parts of the door and frame; Fig. 2, a longitudinal side elevation of my hinge, Fig. 1, looking from G toward A, and open; Fig. 3, a transverse section on line G H of Fig. 1, above the sockets ii and on line B C of Fig. 2; one of my hinges being attached to a door, shutter or lid 19 and frame a, and swung open. Fig. at is a transverse section on same line as in Fig. 3, but with the door, shutter or lid band hinge closed; Fig. 5, a vertical longitudinal elevation E F, G H, of one of my improved hinges open, and looking from B and D toward A of Fig. 3, beinga reverse view of Fig. 1; Fig. 6, a longitudinal elevation of one of my concealed hinges closed; Fig. 7, a detail plan view of one of my double segmental curved links e; Fig. 8, a detail longitudinal elevation D B of Fig. 7; Fig. 9, a plan view of one of my concealed hinges having curved leaves 9 g Similar reference letters indicate similar parts throughout the several views.

Heretofore hinges have been composed of two leaves, each having one or more pro j ecting tubes or barrels on their adjoining edges, said barrels being alternate, gearing into each other and connected by a pin or pivot which passes longitudinally through them; or in the case of butt hinges, by a barrel on the edge of one leaf and a projecting pin on the adjoining edge of the other leaf, the pin fitting into said barrel; these forms of hinges are objectionable for many purposes as the barrels and pins project beyond the face of the door or other article to which they are attached when it is closed, particularly where a fiat surface is desired as in the case of a piano lid, flat desk lid, table lid, folding shutters, screens or similar articles.

I am also aware that hinges have been made composed of a link with a projection and pin in each end, the projections fitting into recesses and the pins fitting into slots in their respective boxes, making it essential that the pins shall not be fixed but slide in their slots thus sliding the centers of the links to different positions, the boxes being placed, one in the frame and the other in the door. Curved bars, pivoted at one end and with 2. lug at the other end have been made to connect the two leaves. Curved sections of tubes telescoping into each successive tube have been suggested for the same purpose, but these devices are not sufficiently positive in their action and consequently are not satisfactory.

By my improvements hereinafter described, I avoid this objectionable projection of barrel hinges, as my concealed hinge does not project beyond the surface of the door and frame to which it is attached when the door or lid is closed. I also avoid the defective construction of the link, bar and telescope hinges previously referred so, as myimprovement is positive in its action.

My improvement consists of two leavesl Z, each having one or more sockets 71 i, of a double segmental curved link e, one end of said link being loosely pivoted at h into the socket of one leaf Z by the pivot is, the other end of the link 6 being loosely pivoted at h into the socket of the other leaf Z by the pin or pivot 70, or the reverse, as the two ends of the link e may be made similar and interchangeable. My double segmental curved link 6 is composed of two segments each subtending an angle of about or a little more than a quarter of a circle, and connected together at their intersection, as shown in horizontal section at A 6 Fig. 3; their respective centers at h and it having pivots 7t 7a which rotate or oscillate at h h at fixed centers in the adjoining angles of the walls 11 z" of the sockets of their respective leaves 1 and Z, as in Fig. 3. I have shown stops m m at the exterior ends of the double segmental curved link e, which will necessarily be at or near the face 0' r when the hinge is closed, as at Fig. 4, but when the hinge is opened as at Fig. 3, will be at s s, and act as stops, preventing the door 12 from striking the frame or wall a, but they may be dispensed with if not wished for this purpose. The two segments of the double segmental curved link may be made solid if desired, but I prefer to make them hollow, and have so shown them in the drawings.

To use my concealed hinge, one leaf Z and its socket 2', containing one end on of the link e, are mortised into a cavity 19 and fastened by screws '21 n (or other suitable and well known means) into a frame a, giving space for the movement of the end or stop m of the link e beyond the walls of the socket z, a shoulder or abutment 8 being provided on the leaf Z for the engagement of said stop we when the door I) is open. The other leaf Z and its socket 2" containing the other end m of the link e, being similarly mortised into a cavity 12 in the door or lid 1) or the reverse, as the two straight leaves Z and Z and their sockets it may be made similar and interchangeable. When the door b and hinge are closed as in Figs. 4, 5, 6 and 9, the ends m m of the link e will be at the side r r of the hinge, but when the door I) and hinge are wide open, as in Figs. 1, 2 and 3, the ends m m of the link e will be at the opposite side of the hinge and will be against the shoulders or abutments s s of the hinge.

The operation of my hinge is as follows:- Having the door or lid I) closed, it will appear with the frame a in horizontal section as in Fig. 4, with the extreme ends m m of the double segmental curved link at r r, and in rear elevation as indicated in Fig. 5, the link e e, being shown in detail in Figs. 7 and 8. By drawing or opening the door I) toward r the double segmental curved link e e will oscillate or partly rotate on its two centers or pivots 7a It at h h in the angles of the respective sockets in the leaves Z Z until the door is opened to its fullest extent, when the ends m 11?. will have moved to s s, the link e cappearing as e c Fig. 1 in vertical longitudinal elevation; and at Fig2 in side elevation looking from G toward H of Figs. 1 and 3.

What I claim, and desire to secure by Letters Patent of the United States, is

In'a concealed hinge the combination of the two leaves ZZ' having sockets i and i and abutments 8 s, with the double segmental curved link e 6 having stops m m", said link having one end pivoted on a fixed center in one socket and capable of rotating or oscillating segmentally therein, the other end of said link being similarly pivoted on a fixed center in the other socket and also capable of rotating or oscillating in the latter, said sockets being attached to frames and doors or lids as and for the purposes shown and described.

In testimony that I claim the foregoing as myinvention I have signed my name, in presence of two Witnesses, this 12th day of February, 1892.

ALFRED A. OAT, SR. [1.. s.]

Witnesses:

C. HENRY Ronny, ARTHUR C. SNYDER. 

